Small Cluster

  • This cluster size is comprised of:

    • Ten (10) node OpenShift cluster

    • Control plane + compute running on three (3) nodes

    • Storage running on three (3) nodes with compute

    • Additional four (4) nodes of “just” compute

    • Example node size:

      • CPU: 64 cores

      • Memory: 512GiB

      • OS Disks: 2x512GB (RAID1)

      • Cluster Storage (ODF): 8x 8TB NVMe/SSD disks

      • Network: 6x 25Gb NICs

    • The resulting cluster has 1532 vCPU, 3496GiB memory, and 41.6 TB storage available for workloads.

      • 20% of compute and memory capacity is reserved for HA

      • 10% of compute capacity is reserved for spare/burst

      • The suggested storage capacity above reflects 65% of the capacity used

The resulting cluster has three node types (compute, compute + storage, compute + control plane) which contribute capacity for hosting virtual machines in addition to their shared purpose (ODF or control plane).

Here is a high-level design for the small form factor cluster:

small cluster design